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Chapter 19. Reliable and Scalable Systems > Backup and Disaster Recovery

Backup and Disaster Recovery

Backup and disaster recovery are related. Backup refers to the processes that preserve an application's data in the face of hardware failures such as disk crashes. Disaster recovery is the broader term that includes the procedures and systems that enable the application to recover not only from hardware failures but also from power losses, earthquakes, and communications failures.

When business applications were primarily batch-oriented, backup and disaster recovery were fairly simple to understand. As transactions occurred, they were written on tapes. Once a day, the transaction tapes were merged with master files on other tapes. Maintaining backups meant saving the old tapes, and in the event of a site disaster, the tapes could be easily run on a similar computer in a different data center.


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